From 9bc77f5ad4a2ee2d143c4ec1fc92be4e201d174d Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Thu, 28 Apr 2016 07:47:54 -0400
Subject: [PATCH] Add a comment about SOURCE_DATE_EPOCH to the makefile.

---
 makefile | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/makefile b/makefile
index 1486a26..6cd7eee 100644
--- a/makefile
+++ b/makefile
@@ -41,6 +41,14 @@ SRCS = $(PN).tex $(shell kpsewhich $(BIBS)) $(shell kpsewhich $(MJOTEX))
 # The process is kind of like finding a fixpoint of `make` with
 # respect to the contents of the aux file.
 #
+# Why use the aux file and not the PDF, which is what we really care
+# about? The pdflatex tool currently embeds the creation/modification
+# time into the PDF, so every new version will differ from the last,
+# making comparisons meaningless. This is fixed in pdftex v1.40.17
+# thanks to Debian's SOURCE_DATE_EPOCH initiative. When that version
+# of pdflatex makes it into TeX Live 2016, we can replace this junk
+# with something smarter
+#
 $(PN).pdf: $(SRCS) $(PN).aux $(PN).bbl
 	mv $(PN).aux $(PN).aux.bak
 	$(LATEX) $< && $(LATEX) $<
-- 
2.43.2